SIFIVE_SERIAL_TXCTRL_NSTOP_SHIFT   80 drivers/tty/serial/sifive.c #define SIFIVE_SERIAL_TXCTRL_NSTOP_MASK		(1 << SIFIVE_SERIAL_TXCTRL_NSTOP_SHIFT)
SIFIVE_SERIAL_TXCTRL_NSTOP_SHIFT  510 drivers/tty/serial/sifive.c 	v |= (nstop - 1) << SIFIVE_SERIAL_TXCTRL_NSTOP_SHIFT;